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RAFT Radar Fence Transponder Critical Design Review

RAFT Radar Fence Transponder Critical Design Review. Bob Bruninga, CDR USN (ret) MIDN 1/C Ben Orloff MIDN 1/C Eric Kinzbrunner MIDN 1/C JoEllen Rose Midn 1/C Steven Schwarzer. Key Milestones: Schedule. Assumption: Launch NET February 2006 RAFT Kickoff Apr 04

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RAFT Radar Fence Transponder Critical Design Review

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  1. RAFTRadar Fence TransponderCritical Design Review Bob Bruninga, CDR USN (ret) MIDN 1/C Ben Orloff MIDN 1/C Eric Kinzbrunner MIDN 1/C JoEllen Rose Midn 1/C Steven Schwarzer

  2. Key Milestones: Schedule • Assumption: Launch NET February 2006 • RAFT Kickoff Apr 04 • RAFT USNA SRR Sep 04 • RAFT PDR19 Nov 04 • RAFT Phase 0/1 Safety 16 Dec 04 • RAFT Phase 2 Safety 10 Feb 05 • RAFT CDR 23 Feb 05 • RAFT Flight Unit Testing May 05 • RAFT Phase 3 Safety Aug 05 • RAFT Delivery/Install Oct 05 • RAFT Flight (STS-116) 09 Feb 06

  3. So Many CUBEsats 30 to 50 in Construction How to Track them??? AIAA/USUSmall Sat Conference 30% of papers were for PICO, NANO and CUBEsats All smaller than 10 cm

  4. Mission Statement • To provide the Navy Space Surveillance (NSSS) radar fence with a means to determine the bounds of a constellation of PicoSats otherwise undetectable by the radar fence • To enable NSSS to independently calibrate their transmit and receive beams using signals from RAFT. • This must be accomplished with two PicoSats, one that will actively transmit and receive, and one with a passively augmented radar cross-section. • Additionally, RAFT will provide experimental communications transponders for the Navy Military Affiliate Radio System, the United States Naval Academy’s Yard Patrol crafts, and the Amateur Satellite Service.

  5. NSSS Radar Fence

  6. RAFT1 Mission Architecture

  7. MARScom Mission Architecture

  8. Military Affiliate Radio System • The Mission of the MARS system is to: • Provide auxiliary communications for military, federal and local disaster management officials • Assist in effecting communications under emergency conditions. • Handle morale and quasi-official communications traffic for members of the Armed Forces and authorized U.S. Government civilian personnel • Provide routine operations in support of MARSGRAMS and … contacts between service personnel and their families back home home.

  9. Yard Patrol Craft Application Unique UHFAM Uplink and HF SSB downlink

  10. RAFT1 and MARScom 5” Cubes 3 Antennas Each Identical Mechanical

  11. PassGeometry

  12. Raft1 Block Diagram

  13. MARScom Block Diagram

  14. RAFT Lifetime Estimate 3.8 Mo 6.5 Months

  15. MARScom Lifetime Estimate 3 Mo 4.9Months

  16. RAFTDeployment Velocity of pair: 1.5 m/s Velocity of RAFT: 1.19 m/s Velocity of MARScom: 1.91 m/s

  17. Low Friction Track Separation Test

  18. Mechanical Design

  19. Using “IDEAS” CAD Modeling

  20. Assembly & Fasteners

  21. Solar Panel Design on 5 Sides COTS Silicon Cells on PCB panel Covered with Clear Teflon Coating 1.5 Watt panel Mechanically rugged for rain/hail/birds PCsat Flight Heritage

  22. Multi-Function Top Panel VHF Antenna holes HF whip hole Pockets for other satellite antennas and Sep Switch

  23. RAFT1 Internal DiagramTop View Ant pocket & Sep SW

  24. RAFT Internal Corner Detail Whip antenna and sep springs

  25. RAFT SEP-SwitchCorner Detail

  26. MARS- comm Internal Top View

  27. Side Panel

  28. Side Panel Detail Loaded Side .25” thick

  29. SSPL4410 LAUNCHER: Operation 1. NEA DEVICE ACTUATES 2. LATCH ROD SLIDES FORWARD 3. DOOR SWINGS OPEN AND LATCHES 4. PICOSATs EJECT 3 4 Door in open, latched, landing position 2 No separation until after both picosats clear launcher NOTE: Top Cover and LatchtrainCover not shown in this view 1

  30. SSPL4410 LAUNCHER: Preload and Launch Loads • For SSPL4410 with MEPSI: • PICOSAT mass m = 1.6 kg = 3.5 lbs • Preload > { 24 g x 3.5 lbs = 84 lbs } • F = 125 lb max preload + 24 g x 3.5 lb  210 lbs • 24 g calculated in SVP • For SSPL5510 with RAFT: • PICOSAT mass m = 7 kg = 15.4 lbs • Preload > { 24 g x 15.4 lbs = 370 lbs } • F = 500 lb max preload + 24 g x 15.4 lb  870 lbs credit:

  31. Side Panel Buckling Analysis

  32. Structure Displacements

  33. Depressurization Rate .040 hole Gives 2:1 margin for depressurization

  34. Battery Box

  35. Custom Side Panel for Antenna Crank and GSE Connector

  36. RAFTAntennaSeparationMechanisms

  37. Assembly Plan

  38. RAFT Antenna Springs

  39. Antenna Detail

  40. Separation Velocities Click here for entire documentation

  41. Antenna Buckling Analysis

  42. Long-Wire Antenna Assy

  43. Long-Wire Antenna Detail

  44. VHF EZNEC Plots

  45. RAFT1 Magnetic Attitude Control

  46. Engineering Drawings • Top Panel • Bottom Panel • TX Panel (Page 1 / Page2) • RX Panel (Page 1 / Page 2) • HF Spool/Casing

  47. Mass Budget (kg)

  48. RAFT1 Panels and Connectors Each panel one pigtail All plug into Interface Board on the PSK panel New @ CDR

  49. Interface Board

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